Well, comments from the so called "professional" installers above notwithstanding, I think you can buy speakers and get some upgrade in overall sound. The term "bass" is somewhat subjective. If you really want more bass, then you probably will have to adjust the height of the bar here and open your wallet more for additional equipment. That is a slippery slope, though, I want to warn you. Once you start down that road, there could be no end to your appetite to improve the sound system. It's like trying heroin. You will want one more fix, and it never ends. Pretty soon, you find yourself in the local detox for buying too many amplifiers.